When Prince William presented Professor Gore with his award he said: ‘I’ve found Martin a source of inspiration – his infectious enthusiasm and passion for his work, and his obvious compassion and kindness for his patients, their family and friends,reinforces my knowledge that the Royal Marsden is a truly special place.

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‘He’s one of the pioneers of 20th century cancer care, and a friend, colleague and trusted doctor to many.’

The yellow fever vaccine is recommended to anyone travelling to Africa, parts of South and Central America and the Caribbean.

The Duke of Cambridge called him an ‘inspiration’ when he present Professor Gore with a lifetime achievement award (Picture: PA)

But it is not always recommended for certain groups of people, including the over sixties.

Serious side effects, affecting the brain or other organs, occur fewer than ten times for every million doses of the vaccine, the NHS says.

A spokeswoman for Royal Marsden said they would not be commenting on the cause of Prof Gore’s death.